Compound Formation and Crystal Structure in the System ZnO-TiO2

Abstract

Fig. 3. Triple-exposure view of melted single crystal of MgO.In two melting experiments, the temperature of the crystal was observed to be 85°C. higher than that measured in the graphite cylinder, the difference being attributed to reflection by the crystal of the radiation from the susceptor wall. Blackbody conditions were assumed for the cylinder measurements, and it is these values that are reported. Corrected temperatures for the melting point of MgO obtained in separate experiments were 2824" and 2829°C. Thus, a melting point of 2825" f 20°C. is indicated for MgO. The agreement of In a1Structure in the System ZnO-Ti02 8 J. lition to the well-known zinc orthotitanateFormation of the latter compound appe (Zn?Ti04) and zinc metatitanate (ZnTi03), the study of solid-state reactions in the system ZnO-Ti02 disclosed a previously unrecognized compound, ZngTi30~. This compound was obtained when sulfate-containing hydrous titanium oxide of anatase structure was reacted with ZnO at 700" to 900°C. It crystallized in a defect spinel structure with eight Zn2+ ions occupying the tetrahedral positions and twelve Ti4+ ions distributed in sixteen octahedral positions (a, = 8.395 f 0.002 a.u.). Crystallographic data are given for zinc orthotitanate and metatitanate.. in red to be favored by rutile TiOz sources and those readily convertible to rutile under the reaction conditions.

Densification rate and phase structure changes during sintering of zinc titanate ceramics

“…The determined average green sample density was 2.34 g/cm 3 (45.3% of the theoretical density of ZnTiO 3 of 5.16 g/cm 3 [16]). Obviously denser green samples could be obtained by applying higher pressures, but as the particle size of the starting powder was small it was difficult to obtain green samples that did not laminate prior to sintering when higher pressures were applied.…”

“…Samples were analyzed for the presence of ZnTiO 3 , Zn 2 TiO 4 , Zn 2 Ti 3 O 8 and r-TiO 2 (rutile). ZnTiO 3 was refined as hexagonal, space group R3 (rhombohedral cell), a = 5.07833(3), c = 13.927(1) Å , Z = 6 [16]. Starting values for atom parameters of ZnTiO 3 were taken from the refinement of FeTiO 3 performed by Wechsler and Prewitt [17].…”

Formation and Structure of TiZn‐Oxides

“…The proposed structure model of the defect spinel Zn2Ti308 ( BARTRAM et al 1961) is based on two considerations:…”

Synthesis and characterization of (Zn,Co)TiO3 by modified low temperature preparing route

“…Much attention was paid to the synthesis and electrical properties of zinc metatitanate (ZnTiO 3 ) for its attractive applications in microwave dielectrics [1][2][3][4][5][6][7][8][9][10]. There are three phases, Zn 2 TiO 4 , Zn 2 Ti 3 O 8 , and ZnTiO 3 , existing in the ZnO-TiO 2 system [1,3,7].…”